Table 5 Major and minor errors observed in phylogenetic trees constructed by students
From: Student construction of phylogenetic trees in an introductory biology course
Major error | Group unit exam (n = 23) | Individual final exam (n = 77) | Group final exam (n = 22) |
|---|---|---|---|
Incorrect relatedness | 0 (0Â %) | 10 (13Â %) | 3 (14Â %) |
Incorrect traits | 1 (4Â %) | 10 (13Â %) | 3 (14Â %) |
Contemporary descent | 5 (22Â %) | 12 (16Â %) | 5 (23Â %) |
Minor error | |||
Empty branches | 6 (26Â %) | 31 (40Â %) | 5 (23Â %) |
Extra nodes | 10 (43Â %) | 30 (39Â %) | 8 (36Â %) |
Side branches | 0 (0Â %) | 7 (9Â %) | 1 (5Â %) |